| Qsquare (Brighton) Ltd | Real estate | 2024 |
| Qtmn Ltd | Other services | 2026 |
| Quadtone Limited | Construction | 2023 |
| Quality Accountancy Limited | Professional & scientific | 2013 |
| Quality Property Services Ltd | Wholesale & retail | 2018 |
| Quality Review Services Limited | Professional & scientific | 2016 |
| Quality Seafoods Ltd | Wholesale & retail | 2020 |
| Quality Sweets and Food Limited | Hospitality | 2020 |
| Qualitysolutions Ltd | Transport & logistics | 2021 |
| Quantitative Brokers UK Limited | Information & communication | 2013 |
| Quantrafin LLP | | 2025 |
| Quantrex Trading Ltd | Wholesale & retail | 2025 |
| Quantum AI Ltd | Information & communication | 2025 |
| Quantum Life Leaps Limited | Professional & scientific | 2018 |
| Quantxz Ltd | Professional & scientific | 2021 |
| Quartet 2 Limited | Real estate | 2022 |
| Quatrro Limited | Construction | 2024 |
| Qubetech Limited | Information & communication | 2023 |
| Qubient Ltd | Information & communication | 2026 |
| Qudasil Limited | Wholesale & retail | 2025 |
| Quebec Estates Ltd | Real estate | 2022 |
| Queberry Technologies Ltd | Information & communication | 2022 |
| Queentana Trading Company Limited | Other services | 2011 |
| Quest House Hounslow Limited | Construction | 2020 |
| Quick Completions Limited | Professional & scientific | 2015 |
| Quick Complettions Ltd | Households | 2024 |
| Quick Contractor Ltd | Construction | 2021 |
| Quick Load Ltd | Transport & logistics | 2020 |
| Quick PIC Market Ltd | Wholesale & retail | 2024 |
| Quick Pick LB Ltd | Hospitality | 2024 |
| Quick Score Limited | Information & communication | 2013 |
| Quick Start Learning Limited | Education | 2026 |
| Quick Stop Local Limited | Wholesale & retail | 2026 |
| Quickassert Consulting Limited | Information & communication | 2018 |
| Quickcartdeals Limited | Wholesale & retail | 2025 |
| Quickers PVT Ltd | Other services | 2019 |
| Quickshift Services Ltd | Transport & logistics | 2024 |
| Quicktimecleaning Ltd | Administrative & support | 2026 |
| Quinkaris Health Care Solutions Ltd | Health & social care | 2020 |
| Quyrex Limited | Wholesale & retail | 2025 |
| Qway Accessories Limited | Wholesale & retail | 2024 |
| QWC Web Solutions Ltd | Professional & scientific | 2026 |
| R & G Loft Conversions Ltd | Construction | 2015 |
| R & H Technologies Limited | Information & communication | 2018 |
| R & T Asset Management Ltd | Real estate | 2022 |
| R & W Kitchen Fitting and Project Management Ltd | Construction | 2019 |
| R & Partners Ltd | Transport & logistics | 2020 |
| R C Wood Cars Ltd | Wholesale & retail | 2022 |
| R D Estates Ltd | Real estate | 2021 |
| R G a Deliveries Ltd | Transport & logistics | 2022 |
| R G S Renewables Ltd | Construction | 2012 |
| R K Food & Wines Ltd | Wholesale & retail | 2013 |
| R S TLA Ltd | Real estate | 2024 |
| R Sandhu Consultancy Ltd | Information & communication | 2016 |
| R V Hospitality Ltd | Hospitality | 2025 |
| R Vrindavan Ltd | Wholesale & retail | 2025 |
| R Z Supermarket Ltd | Households | 2017 |
| R&D Medical Enterprises Ltd | Wholesale & retail | 2025 |
| R&G UK Construction Ltd | Construction | 2026 |
| R&M Business Consultants Limited | Professional & scientific | 2023 |
| R&M Properties London Ltd | Real estate | 2025 |
| R&S Smiles Ltd | Health & social care | 2023 |
| R-Tech Nextgen Limited | Information & communication | 2025 |
| R.G.S Electrical Services (London) Limited | Construction | 2018 |
| R.K. Building Contractors Limited | Construction | 2016 |
| R.U.X.T. Ltd. | Manufacturing | 2013 |
| R9 Technologies Ltd | Information & communication | 2021 |
| RA Designs and Build Ltd | Construction | 2020 |
| RA Residential Limited | Real estate | 2024 |
| Raab Properties Ltd | Real estate | 2021 |
| RAB Catering Limited | Hospitality | 2026 |
| Rabakes Ltd | Other services | 2022 |
| Rabo Ltd | Information & communication | 2025 |
| Rabs Real Estate Limited | Real estate | 2025 |
| Rachel Pomorie Ltd | Construction | 2023 |
| Raddar Investments (RK) Ltd | Real estate | 2022 |
| Radha Krishan Limited | Real estate | 2024 |
| Radha Krishna & Sons Limited | Real estate | 2018 |
| Radhe Radhe Store Ltd | Wholesale & retail | 2026 |
| Radhikas Foods Ltd | Hospitality | 2025 |
| Radiant Haven Limited | Real estate | 2024 |
| RAF Associates Limited | Administrative & support | 2021 |
| RAF Beauty Ltd | Other services | 2025 |
| RAF Plumbing & Heating Ltd | Construction | 2020 |
| Rafafx Ltd | Administrative & support | 2023 |
| Rafat Top Style Ltd | Other services | 2025 |
| Rafe Hamilton Ltd | Manufacturing | 2015 |
| Rafleen Ltd | Professional & scientific | 2025 |
| Rafnest Ltd | Real estate | 2021 |
| Raghava RAM Limited | Transport & logistics | 2026 |
| RAHI99 Limited | Wholesale & retail | 2024 |
| RAI Capital Ltd | Professional & scientific | 2017 |
| RAI Group Property Ltd | Real estate | 2023 |
| RAI Tech Solutions Ltd | Information & communication | 2022 |
| Raika Logistics Ltd | Transport & logistics | 2025 |
| Rainbow Pictures Ltd | Information & communication | 2023 |
| Rainbow Products Ltd | Wholesale & retail | 2020 |
| Raise Travel Ltd | Administrative & support | 2003 |
| RAJ and Sons Trading Ltd | Wholesale & retail | 2026 |
| RAJ Brothers (UK) Ltd | Wholesale & retail | 2014 |